The answer would be A.
The description of "Unlike normal rocks, they have trails etched behind them as if they have traveled across the sand.", provides detail to support the main idea that "drifting" rocks are strange. Some keywords that will help you understand the main idea that "Drifting Rocks are Stange" :
°Unlike
°Traveled
°Trails
Hyperbole, is a figure of speech that uses extreme exaggeration to make a point or show emphasis. It is the opposite of understatement.
Example: 1. She’s as thin as a toothpick.
2. If I can’t get a smartphone, I will die.
An allusion is an expression designed to call something to mind without mentioning it explicitly; an indirect or passing reference.
Example: 1. “I was surprised his nose was not growing like Pinocchio’s.” This refers to the story of Pinocchio, where his nose grew whenever he told a lie. It is from The Adventures of Pinocchio, written by Carlo Collodi.
2. “He was a Good Samaritan yesterday when he helped the lady start her car.” This refers to the story of the Good Samaritan who was the only one to stop and help a man in need.
Customer: I want to have my hair trimmed.
Barber: Please sit for some time.
C: Actually, I have to go somewhere so, I can't wait.
B: You can come back after doing the job.
C: No, no that's not possible. That's a bit off.
B: You see all the dressers are busy.
C: When will you become free?
B: It won't take more than ten, fifteen minutes. I have to do one more shave and that's all.
C: In that case, I will wait.
B: Thanks, you can read the newspaper to kill the time.
C: O.K., O.K., I will manage somehow.
B: (To another customer) come on, it is your turn.
C: Yes, I am.................
B: (After some half an hour) I am sorry, I took more time.
C: I knew, it happens.
B: Please, raise yourself a bit.
C: O.K., but please make me free soon.
B: No matter what happens!
C: (Laughing I mean, quick but right.
B: How much trimming do you want?
C: Better you decide neither that long, nor that short.
B: It's our duty to ask because everyone has his own choice.
C: Yes, I do understand.
B: (After fifteen minutes) you can check in the mirror.
C: Everything is O.K., just let me leave and how much?
B: Forty rupees.
C: I thought it would be something like thirty.
B: Whatever you like.
C: No, I was just saying.
